D.C. United beats defending champion Atlanta United 2-0
Bill Hamid had two saves for his fourth shutout in his last five regular-season starts.
D.C. United is unbeaten in its last 11 regular-season matches.
Diomande cut back to evade a defender at the top-left corner of the box and blasted a rising shot.
Krisztian Nemeth opened the scoring for Sporting KC in the 16th, and Diego Rossi tied it in the 47th.